Bolthole Index

Gallatin County, Montana

Building permits, zoning and land rules in Gallatin County, Montana

77Index Score / 100
#2 of 56 in Montana

Gallatin County, Montana does not issue building permits, but county-zoned unincorporated land generally needs a Land Use Permit before construction1. In state jurisdiction, homes with fewer than five dwelling units are exempt from state building permits unless serving transient guests2. Municipal building and zoning requirements differ, while the Gallatin City-County Health Department requires local septic approval before installation countywide345.

At a glance

Building permit
No county building permit; state permits exempt homes with fewer than five dwelling units unless serving transient guests2
Land Use Permit
Generally required in county zoning districts before construction; submit online through MyGov67
Zoning
District-specific; use county maps and regulations to identify the parcel's rules38
Septic permit
Required before installation through the Gallatin City-County Health Department5
RV use
District- and use-specific; temporary personal camping is not the same as long-term residence910
Owner plumbing
A personal-use homeowner may do the plumbing personally without a state plumbing permit, subject to conditions11
Minimum lot size
Depends on the zoning district and subdistrict; there is no single countywide figure12
Septic soils
20.6% of soils are rated not limited for conventional drain fields; a parcel still needs evaluation13

Who to call

Zoning

Gallatin County Planning & Community Development

Zoning, Land Use Permit applications, property-information requests, and floodplain questions for unincorporated Gallatin County

406-582-3130

planning@gallatin.mt.gov

Floodplain permits

Gallatin County Planning & Community Development (Floodplain Administration)

Floodplain questions and permitting for work in Gallatin County regulatory floodplains

406-582-3130

Septic permits

Gallatin City-County Health Department (Environmental Health)

Wastewater-system permits, registration, plan review, and inspections in Gallatin County

406.582.3120

ehs@gallatin.mt.gov

400 E. Babcock Street, Bozeman, MT 59715

Roads & driveways

Gallatin County Road & Bridge Department

County-road access permits and work within county-maintained road rights-of-way

406-582-3250

RoadDept@gallatin.mt.gov

205 West Baxter Lane, Bozeman, MT 59178

Roads & driveways

Gallatin County Road & Bridge Department — Permit Applications

Road Access Permit applications for driveways and approaches onto county-maintained roads

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

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Going off-grid in Gallatin County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Gallatin County, Montana?

Gallatin County does not issue building permits and directs applicable projects outside Bozeman and Belgrade to the Montana State Building Department1. In state jurisdiction, residential buildings with fewer than five dwelling units are exempt from state building permits unless serving transient guests; local requirements may still apply2. Farm and ranch buildings also fall within the state building-permit exemption, which does not establish exemption from separate electrical, plumbing or mechanical requirements1415. Montana adopts a uniform state building code; applicability depends on state exemptions and certified local jurisdiction16.

In county-zoned unincorporated Gallatin County, a Land Use Permit is separate zoning approval generally required before building, moving a structure or making structural alterations, subject to district exceptions6. Pouring concrete or installing permanent improvements before that approval is prohibited; preparatory site work is at the landowner’s risk6. Structures exempt from Land Use Permitting still must meet applicable setbacks, height and lot-coverage standards17.

Who handles building permits and inspections in Gallatin County?

For applicable projects in state jurisdiction, contact the Montana State Building Department at 406-841-2040; Gallatin County issues no building permits1. Town of Manhattan issues building permits for buildings or enclosed structures greater than 200 square feet, and Town of West Yellowstone requires building permits for covered construction and structural changes418. Local septic permitting stays with the Gallatin City-County Health Department throughout the county195.

For state-permitted projects, the permit holder must notify the inspector when work is ready and provide access20. County zoning approval is separate: the Planning Director may require a Certificate of Completion and zoning-compliance inspection with a Land Use Permit or Change of Use Permit21. Reach Gallatin County Planning & Community Development at 406-582-3130 or planning@gallatin.mt.gov for unincorporated-land zoning questions322.

Does Gallatin County have zoning, setbacks and height limits?

Gallatin County publishes 22 zoning districts with distinct requirements; identify the parcel’s district and subdistrict before applying development standards to unincorporated land8. Bozeman, Town of Manhattan, Three Forks and Town of West Yellowstone set their own zoning inside municipal limits23242526. Local septic approval remains with the Gallatin City-County Health Department19.

Bear Canyon residential standards require front yards of 35 feet, rear and side yards of 25 feet, and building setbacks of 65 feet from the centerline of Bozeman Trail Road, Mount Ellis Lane, Bear Canyon Road or any county road in the district27. Bear Canyon residential building height is capped at 32 feet28. East Gallatin’s Neighborhood Commercial and Commercial districts require front and rear setbacks of 15 feet and side setbacks of 10 feet29.

Short-term rentals unlisted in a zoning district’s regulations are prohibited there; unzoned areas have no county zoning restriction on that use, but Health Department public-health and sanitation permitting applies in both zoned and unzoned areas30.

What are Gallatin County’s minimum lot sizes?

Gallatin County minimum lot sizes depend on the zoning district and subdistrict; unzoned land divisions still need Planning Department review of applicable subdivision processes12. In Gallatin Canyon/Big Sky, R-SF-7,500 and R-SF-11,000 require 7,500 and 11,000 square feet respectively, while RC-SF lists no minimum lot size; other development standards still apply31. The Recreational Business subdistrict requires at least one acre32.

River Rock requires 4,500 square feet and 45 feet of width for Duplex Townhouse and Traditional Single Family lots; other permitted principal uses require 7,500 square feet and 70 feet of width33. Zoning District 6 Agriculture Exclusive requires 40 acres and 660 feet of width, except for agricultural-production land34. Residential Suburban districts there require at least one acre and 150 feet of width, with larger lots possible because of district designation, soils or groundwater35.

How do septic permits work in Gallatin County?

The Gallatin City-County Health Department requires an approved septic permit before any non-public or public wastewater treatment system is installed in Gallatin County5. Applications need signed wastewater-treatment and property-information-request forms, fee payment and a scaled site plan; site evaluation must be performed by a county Registered Site Evaluator or Montana-registered professional engineer, and a county Registered Installer must be on-site during installation36. Call Environmental Health at 406.582.3120 or email ehs@gallatin.mt.gov37.

Montana DEQ has primary responsibility for public wastewater systems serving more than 24 people for more than 60 days a year or having more than 14 connections19. Only 20.6% of Gallatin County soils are rated not limited for conventional drain fields; this supports evaluating the site before purchase, not assuming septic is impossible elsewhere13.

Can you live in an RV or tiny home on land in Gallatin County?

We could not confirm a countywide tiny-home occupancy rule; ask Gallatin County Planning how the proposed dwelling fits the parcel’s district228. River Rock’s Residential Single Family Medium Density district requires each dwelling unit to have at least 900 square feet of floor area and limits lot coverage to 40%, a concrete constraint on a small-home design there38.

In Gallatin Canyon/Big Sky, temporary personal-use camping with no more than five tents or RVs falls outside the campground definition; that provision does not authorize permanent RV residence9. Renting multiple RV spaces requires subdivision review, and RV parks in the Commercial and Industrial Mixed Use subdistrict are conditional uses subject to campground, utility and subdivision standards1039.

Building a home in Gallatin County: what are the steps?

  1. Ask Gallatin County Planning to identify the parcel’s zoning district and the required Land Use Permit; call 406-582-3130 or email planning@gallatin.mt.gov8622.
  1. Assemble applicable wastewater, floodplain and road-access documentation; wastewater evidence can include a septic permit or approval to connect to an existing system, plus Montana DEQ subdivision approval where applicable640.
  1. Submit the complete Land Use Permit application through MyGov and allow at least four weeks for staff processing, subject to seasonal demand7. Planning’s new fee schedule took effect September 21, 2026; credit-card payments add 3%, while check and cash payments are accepted417.
  1. Ask the Montana State Building Department which building and trade permits apply outside Bozeman and Belgrade; separate electrical, plumbing and mechanical permits may be required215.
  1. Obtain required county land-use approval before pouring concrete or installing permanent improvements, and arrange applicable state inspections and any county Certificate of Completion inspection62021.

What should you check before buying or building in Gallatin County?

Start with County Planning to identify zoning, allowable use and Land Use Permit requirements, then establish approved wastewater service before submitting the application8640. In unincorporated regulatory floodplains, grading, excavation, fill, bank stabilization and structures require floodplain approval; mapped floodplains do not cover every flood threat4243. Access onto a county-maintained road needs county road-access approval, while access under Montana Department of Transportation jurisdiction needs an approach permit4445. Subdivision fire-access standards additionally require access within 150 feet of all building exterior parts and capacity for a 30-ton, two-axle fire apparatus; those standards are not a universal driveway rule46.

Land divisions that do not qualify for an exemption follow county subdivision review; the agricultural exemption requires the created parcel to be used exclusively for agriculture4748. A qualifying homeowner may personally install plumbing in a personal-use home without a state plumbing permit, provided the home is not intended for rental or speculative resale11. For a new well using the Montana permit exception, DNRC requires a Notice of Intent before water use beginning in 202649.

Watch-outs

  • Gallatin County’s Land Use Permit is zoning approval; a state building-permit exemption does not remove applicable county land-use requirements26.
  • Gallatin County Planning’s fee schedule changed September 21, 2026; use the current schedule when budgeting an application41.
  • A short-term rental omitted from a Gallatin County zoning district’s regulations is not permitted there, and Health Department public-health and sanitation permitting applies even in unzoned areas30.

Sources

  1. Frequently Asked Questions | Gallatin County, MT, quoted and re-checked
  2. bsd.dli.mt.gov, quoted and re-checked
  3. gallatinmt.gov, quoted and re-checked
  4. Town of Manhattan: 12-1-2: Building Permit Required (Gallatin County), quoted and re-checked
  5. Wastewater (Septic) Treatment - Healthy Gallatin, quoted and re-checked
  6. Zoning Regulations, quoted and re-checked
  7. Land Use Permit Instructions and Information, quoted and re-checked
  8. Land Use Permit Instructions and Information, quoted and re-checked
  9. Gallatin Canyon/Big Sky Zoning Regulation, quoted and re-checked
  10. Gallatin County Subdivision Regulations, quoted and re-checked
  11. Plumbing Permits, quoted and re-checked
  12. Want to Subdivide?, quoted and re-checked
  13. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  14. Building Permits (Montana statewide rule), quoted and re-checked
  15. Building Permits (Montana statewide rule), quoted and re-checked
  16. Building Permits, quoted and re-checked
  17. Part 1 Administrative Regulations, quoted and re-checked
  18. Town of West Yellowstone: Chapter 17.08 Administrative Regulations and Processes (Gallatin County), quoted and re-checked
  19. Wastewater (Septic) Treatment - Healthy Gallatin, quoted and re-checked
  20. Building Permits, quoted and re-checked
  21. Part 1 Administrative Regulations, quoted and re-checked
  22. Gallatin County Planning & Community Development (gallatinmt.gov)
  23. Bozeman: Bozeman Municipal Code, § 38.210.010, Residential districts—Purpose (Gallatin County), quoted and re-checked
  24. Town of Manhattan: 10-1-1: Title (Gallatin County), quoted and re-checked
  25. Three Forks: Three Forks, MT Laws (Gallatin County), quoted and re-checked
  26. Town of West Yellowstone: Chapter 17.06 Establishment of Districts (Gallatin County), quoted and re-checked
  27. Bear Canyon Zoning Regulation, quoted and re-checked
  28. Bear Canyon Zoning Regulation, quoted and re-checked
  29. East Gallatin Zoning Regulation, quoted and re-checked
  30. Short-Term Rental FAQs, quoted and re-checked
  31. Gallatin Canyon/Big Sky Zoning Regulation, quoted and re-checked
  32. Gallatin Canyon/Big Sky Zoning Regulation, quoted and re-checked
  33. River Rock Zoning Regulation, quoted and re-checked
  34. Zoning District 6, quoted and re-checked
  35. Zoning District 6, quoted and re-checked
  36. Septic (Wastewater Treatment), quoted and re-checked
  37. Gallatin City-County Health Department (Environmental Health) (healthygallatin.org)
  38. River Rock Zoning Regulation, quoted and re-checked
  39. Gallatin Canyon/Big Sky Zoning Regulation, quoted and re-checked
  40. gallatinmt.gov, quoted and re-checked
  41. Planning, quoted and re-checked
  42. Floodplains | Gallatin County, quoted and re-checked
  43. Floodplains, quoted and re-checked
  44. Gallatin County Road & Bridge Department — Permit Applications (gallatinmt.gov)
  45. gallatinmt.gov, quoted and re-checked
  46. Gallatin County Subdivision Regulations 1.6.2026, quoted and re-checked
  47. Want to Subdivide? | Gallatin County, MT, quoted and re-checked
  48. Want to Subdivide? | Gallatin County, MT, quoted and re-checked
  49. Exempt Well Updates and Information (Montana statewide rule), quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like 4 of its 6 neighbors, Gallatin County has countywide zoning.

RuleGallatin CountyMadison CountyPark CountySweet Grass CountyBroadwater CountyJefferson CountySilver Bow County
Building permitLimitedLimitedNot requiredLimitedNot requiredLimitedRequired
County zoningYesNoYesYesNoYesYes
Septic permitsGallatin City-County Health Dept.County SanitarianCounty Env. Health Dept.County Env. HealthCounty Env. HealthCounty Env. HealthButte-Silver Bow Env. Health Div.

County locator

Gallatin County in Montana

77
County map
Gallatin County highlighted among the Montana counties · colored by Index score

How Gallatin County scores

Seclusion84100% ev.
Self-Sufficiency53100% ev.
Admin Boringness5590% ev.
Durability56100% ev.
Property Autonomy83100% ev.
Carry Cost67100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$708kTypical home
0.6%Property tax
$4,069Land / acre
24.4"Annual rain
9.4% of yrsSevere drought
0.8 / yr (+0.7)Mid-century 100°F days
16.6 daysMid-century dry spell
1.12" (+6.5%)Mid-century 1-day rain
1.27×Wildfire change factor
100%Forward climate coverage
$2,082Home insurance / yr
5% / yrInsurance growth
0.66%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
2,056People within 30 min
282,071People within 2 hr
16,726Radius comparison (15 mi)
48.5People / sq mi
45.5%Federal land
50.7%Land at 15% slope or less
20.6%Soils rated "not limited" for septic (strict USDA rating)
309,240 acWorkable land screen
53.5%Wooded land
32.5 tonsBiomass / forest ac
40°FAvg temp

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Cities and towns in Gallatin County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Answers from the rulebook for Gallatin County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Gallatin County rules

  • Building permitLimited

    Residential construction and other projects in Gallatin County, with county zoning/land-use administration, municipal permit jurisdictions, and state building-code jurisdiction outside Belgrade and Bozeman.

    • Gallatin County does not issue building permits.
    • For projects outside Belgrade and Bozeman, the county directs applicants to the State Building Department.
    • State building permits are required for certain non-exempt construction, but state law exempts residential buildings containing fewer than five dwelling units except when serving transient guests.
    • Local requirements may still apply.
    “In the State's jurisdiction, state law exempts the following from the need to obtain state building permits: [...] residential buildings containing less than five dwelling units (except when serving transient guests)”
    One more reviewed finding on this topic
    • Limited — Construction and structural alterations in county-zoned areas outside incorporated municipalities.
      “If you require a Building Permits for a project outside of Belgrade and Bozeman: Contact the State Building Dept. in Helena at 406-841-2040. Gallatin County does not issue Building Permits”
  • InspectionsLimited

    County zoning compliance inspection for projects requiring a Certificate of Completion.

    • A Certificate of Completion is required only where the Planning Director determines it is required as part of Land Use Permit or Change of Use Permit approval.
    • The Certificate of Completion review includes inspection for compliance with applicable zoning requirements.
    • This is not evidence of a state building-code inspection requirement.
    “The Certificate of Completion shall be approved or denied by the Planning Director based on the extent of compliance with the Land Use Permit, or Change of Use Permit, and only when the Planning Director is able to verify, upon inspection, that the applicable requirements of the Zoning Regulations have been met.”
  • County-wide zoningPresent (with conditions)

    County zoning regulations and land-use approvals in Gallatin County, including county zoning districts outside incorporated municipalities.

    • Except as provided in Part 1 Section 6.4, structures generally require an approved Land Use Permit before being built or moved, and structural alterations require approval.
    • Preparatory site work may occur before approval at the landowner's risk; pouring concrete or installing other permanent improvements before approval is prohibited.
    • Applications must include applicable address, wastewater, floodplain, roadway-access, and other zoning documentation.
    • The county zoning page identifies multiple district-specific regulations; requirements vary by district and sub-district.
    “Land Use Permits are required in all zoning districts in Gallatin County.”
  • Local zoningVaries (with conditions)

    Aggregate conclusion for local zoning within Gallatin County, including county zoning districts outside municipalities and separate municipal jurisdictions.

    • Gallatin County has multiple county zoning districts with separate regulations.
    • Incorporated municipalities may administer their own local land-use rules.
    • Property-specific zoning must be checked using the applicable zoning map and district regulation.
    “Zoning, Belgrade City: Planning at Belgrade City Hall [...] Zoning outside of any city limits: County Planning Dept.”
    One more reviewed finding on this topic
    • Varies (with conditions) — Aggregate zoning across Gallatin County, including county zoning outside city limits and separate municipal zoning within incorporated places.
      “Zoning, Belgrade City: Planning at Belgrade City Hall at 91 Central Ave., Belgrade. Zoning, Bozeman City: City Planning at 20 E Olive, Bozeman. Zoning outside of any city limits: County Planning Dept., 1st floor, Room 108 of the County Courthouse.”
  • Zoning districtsPublished

    Gallatin County zoning districts and their associated regulations, maps, and sub-district materials.

    • The county publishes district-specific regulations and interactive zoning maps.
    • A property-specific determination requires identifying the zoning district and sub-district.

    published county zoning districts: 22 districts

    “Gallatin County contains 22 zoning districts, each with unique regulatory requirements. All zoning regulations can be accessed via the Planning Department website.”
    One more reviewed finding on this topic
    • Published — Gallatin County zoning districts and associated maps and regulations.
      “Bear Canyon [...] Zoning Map Zoning Map - interactive Zoning Regulation Development Plan [...] Bozeman Pass [...] Zoning Map Zoning Map - interactive Zoning Regulation”
  • Minimum dwelling sizeSpecified

    Each dwelling unit in the River Rock Residential Single Family Medium Density (R-2) zoning district.

    • The River Rock regulation states that each dwelling unit must have at least 900 square feet of floor area.
    • The district also limits lot coverage to 40 percent.
    • The rule applies only within the River Rock zoning district and its applicable sub-districts.

    minimum dwelling floor area: >= 900 square feet · maximum lot coverage: <= 40 percent

    “minimum of 900 square feet of floor area.”
  • Minimum lot sizeDistrict specific (with conditions)

    Lots subject to Gallatin County zoning and subdivision controls in unincorporated areas.

    • The applicable minimum lot width and area depend on the property's zoning sub-district and other applicable standards.
    • If a property is unzoned, the County directs the applicant to contact the Planning Department regarding subdivision processes.
    • Municipal planning jurisdictions may have their own subdivision authorities and rules.
    “If zoned, check sub-district for development restrictions such as Minimum lot width Minimum lot width and area Allowed density (e.g. dwelling units per acre) Other standards as they apply”
    5 more reviewed findings on this topic
    • Specified — Lots in the River Rock zoning district.
      “no less than 4,500 square feet [...] no less than 7,500 square feet”
    • Specified — Agriculture Exclusive (AE) district in Gallatin County Zoning District 6.
      “Lot area and width shall not apply to lands used for agriculture production.”
    • District specific (with conditions) — Residential Suburban districts in Gallatin County Zoning District 6.
      “less than one acre with a lot width not less than 150 feet.”
    • District specific (with conditions) — Lots in the Recreational Business (RB) subdistrict of the Gallatin Canyon/Big Sky Planning and Zoning District.
      “SECTION 16 RECREATIONAL BUSINESS (R-B) 16.1 Intent: The intent of this district is to provide for large-scale recreational activities and for the Retail and service activities frequently required by recreationists. 16.2 Minimum Lot Size: One acre.”
    • District specific (with conditions) — Lots in the Gallatin Canyon/Big Sky zoning district, where minimum lot-size standards vary by sub-district.
      “Minimum Lot Size: 7,500 square feet. [...] Minimum Lot Size: 11,000 square feet. [...] Minimum Lot Size: None.”
  • SetbacksDistrict specific (with conditions)

    Residential district standards in the Bear Canyon Zoning District of Gallatin County.

    • Every lot must meet the listed minimum yards.
    • All buildings must also be set back 65 feet from the centerline of Bozeman Trail Road, Mount Ellis Lane, Bear Canyon Road, or any county road in the Zoning District.

    front yard setback: 35 feet · rear yard setback: 25 feet · side yard setback: 25 feet · road centerline setback: 65 feet (Bozeman Trail Road, Mount Ellis Lane, Bear Canyon Road, or any county road in the Zoning District)

    “5.7 Yards.Every lot shall have the following minimum yards: Front yard 35 feet Rear yard 25 feet Side yards 25 feet All buildings shall be setback 65 feet from the centerline of Bozeman Trail Road, Mount Ellis Lane, Bear Canyon Road, or any county road in the Zoning District.”
    One more reviewed finding on this topic
    • District specific (with conditions) — Neighborhood Commercial and Commercial districts in the East Gallatin Zoning District.
      “3.10 Setbacks. a. Front setback 15 feet. b. Side setback 10 feet. c. Rear setback 15 feet.”
  • Lot coverageDistrict specific (with conditions)

    Structures in applicable Gallatin County zoning districts and sub-districts.

    • The applicable district regulation controls.
    • Applicable lot-coverage standards continue to apply to structures exempt from Land Use Permitting unless the district regulation clearly provides otherwise.
    “Structures exempt from Land Use Permitting requirements as set forth in the applicable District Regulation must still comply with applicable development standards (e.g. Setbacks, building height, number of accessory structures, lot coverage, etc.).”
  • Building heightDistrict specific (with conditions)

    Residential buildings in the Bear Canyon Zoning District.

    • The quoted maximum applies to residential building height in this district.

    maximum residential building height: 32 feet

    “5.9 Building Height. Maximum residential building height in this district shall be 32 feet.”
  • Living in an RVLimited

    Rent or lease of multiple spaces for recreational camping vehicles and recreational-vehicle camping parks in areas governed by Gallatin County subdivision regulations.

    • The area must be submitted for review and approved by the Governing Body before possession of any portion may be conveyed.
    • Proposals with six or more recreational camping vehicle units follow the Major Subdivision procedure; proposals with five or fewer follow the Minor Subdivision procedure.
    • Plans must comply with county design and improvement standards.
    • Each recreational camping vehicle space must have a minimum area of 1,500 square feet and minimum width of 15 feet.
    • RV parks must meet road, access, parking, recreation-area, and other standards in Section 11.
    • If the subdivision is also a trailer court, work camp, youth camp, or campground under section 50-52-102, MCA, final approval requires a license from the Montana Department of Public Health and Human Services under Title 50, Chapter 52, MCA.

    minimum recreational camping vehicle space area: >= 1500 square feet · minimum recreational camping vehicle space width: >= 15 feet · major-subdivision threshold: >= 6 units (Five or fewer units use the Minor Subdivision procedure.)

    “An area, regardless of its size, that provides for the rent or lease of multiple spaces for recreational camping vehicles or Mobile Homes, and Condominiums are exempt from the survey requirements of these Regulations, but must be submitted for review and be approved by the Governing Body before possession of any portion thereof may be conveyed in any manner.”
    2 more reviewed findings on this topic
    • Limited — Temporary personal-use occupancy involving tents or Recreational Vehicles in the Gallatin Canyon/Big Sky Planning and Zoning District.
      “The definition of campground does not apply to Temporary Uses such as hunting camps, tents or Recreational Vehicles for personal Use, if the number of tents and/or Recreational Vehicles does not exceed five (5).”
    • Allowed (with conditions) — Recreational Vehicle Parks in the Gallatin Canyon/Big Sky zoning district, specifically the Commercial and Industrial Mixed Use sub-district.
      “11.4 Conditional Uses: [...] t. Recreational Vehicle Parks.”
  • Who permits septicMixed (with conditions)

    Wastewater treatment systems in Gallatin County.

    • The Gallatin City-County Health Department administers local wastewater permitting and septic-related environmental-health functions.
    • Montana DEQ has primary responsibility for public wastewater treatment systems serving more than 24 persons for more than 60 days per year or having more than 14 connections.
    • Montana DEQ licenses septic pumpers.

    public wastewater threshold persons: > 24 persons (more than 60 days a year) · public wastewater threshold connections: > 14 connections

    “Montana Department of Environmental Quality (MDEQ) has primary responsibility for public wastewater treatment systems, which are defined as serving more than 24 persons for more than 60 days a year or having more than 14 connections.”
    One more reviewed finding on this topic
    • Mixed (with conditions) — Wastewater treatment systems in Gallatin County administered by the Gallatin City-County Health Department and, for public wastewater systems, the Montana Department of Environmental Quality.
      “Non-public septic (wastewater treatment) systems are for individual, shared, or multi-user dwellings. They are permitted and installed in accordance with state and local regulations. [...] Montana Department of Environmental Quality (MDEQ) has primary responsibility for public wastewater treatment systems, which are defined as serving more than 24 persons for more than 60 days a year or having more than 14 connections.”
  • Septic permitRequired

    Installation of non-public or public wastewater treatment systems in Gallatin County.

    • A local wastewater treatment system permit is required before installation.
    • Applications require a completed and signed wastewater treatment system form, property information request form, fee payment, and a scaled site plan.
    • Site evaluations and credentialed installation requirements also apply.
    “A local wastewater treatment system permit is ALWAYS required before a system (non-public or public) is installed.”
    One more reviewed finding on this topic
    • Required — Non-public and public wastewater treatment systems installed in Gallatin County.
      “An approved septic system permit is ALWAYS required before a system (non-public or public) is installed.”
  • Mandatory utility hookupConditional

    Wastewater service arrangements required to complete a county Land Use Permit application.

    • A Land Use Permit application must include approved wastewater treatment accommodating the project.
    • Acceptable documentation may include a septic permit or approval to connect to an existing wastewater treatment system, such as a water and sewer district or community wastewater treatment system, plus a Certificate of Subdivision Approval from Montana DEQ where applicable.
    “A septic permit (i.e. an Authorization to Construct a wastewater treatment system) from the Gallatin City/County Health Department, or approval to connect to an existing wastewater treatment system (e.g. Water and Sewer District, community wastewater treatment system, etc.) and the Certificate of Subdivision approval from Montana Department of Environmental Quality;”
  • Agricultural exemptionConditional

    Agricultural exemption from Gallatin County subdivision review.

    • The created parcel must be used exclusively for agricultural purposes.
    • The page identifies this as a common exemption but says the overview is not comprehensive and directs applicants to county application instructions.
    “Agricultural exemption (in which the created parcel is used exclusively for agricultural purposes)”
  • Subdividing landRegulated (with conditions)

    Subdivision and division of land within the jurisdictional area of the Gallatin County governing body.

    • Common exemptions include agricultural exemption, certain boundary relocations, family transfers, mortgage surveys, townhouse lots, and condominiums.
    • Projects not qualifying for an exemption proceed through standard subdivision review.
    • The county page says the overview is not comprehensive.
    “If you do not qualify for an exemption, then you will go through the standard subdivision review process.”
  • Driveway accessLimited

    Driveway and fire-apparatus access associated with regulated subdivision development in Gallatin County.

    • The cited rule is for subdivision fire protection and does not establish a universal driveway-approach rule for every parcel.
    • Fire apparatus access must be engineered and constructed to support a 30-ton, two-axle fire apparatus.
    • The road, driveway, or fire apparatus parking area must be within 150 feet of all parts of the exterior of the building.

    maximum distance to building exterior: <= 150 feet (all parts of the exterior) · required apparatus capacity: >= 30 ton (two-axle fire apparatus)

    “Fire apparatus shall be able to park on a Roadway, driveway, or fire apparatus parking area within 150 feet of all parts of the exterior of the building. The Roadway, driveway, or fire apparatus parking area shall be engineered and constructed to safely support a 30-ton, two-axle fire apparatus.”
    One more reviewed finding on this topic
    • Required — Access proposed from a County-maintained roadway for development requiring a county Land Use Permit.
      “Approved encroachment permit for any access coming off of a County-maintained roadway, or an approach permit for any access coming off of a road under the jurisdiction of the Montana Department of Transportation.”
  • Building in a floodplainRequired

    Construction, placement of structures, grading, excavation, fill, bank stabilization, and similar activities within the regulatory floodplain.

    • Gallatin County Floodplain Hazard Management Regulations are identified as Ordinance 2023-004 with effective date May 4, 2023.
    • The mapped floodplain boundaries referenced by the county page have an effective date of April 21, 2021.
    • The county notes that mapped floodplains cover selected stream systems and do not represent all flood threats in Gallatin County.

    ordinance effective date: 2023-05-04 · FEMA map effective date: 2021-04-21

    “Please note that there are permitting requirements for activities such as grading, excavation, placement of fill, bank stabilization work, construction or placement of structures, and other similar activities within the regulatory floodplain.”
    One more reviewed finding on this topic
    • Required — Grading, excavation, fill, bank stabilization, structures, and similar activities within the regulatory floodplain outside municipalities.
      “Please note that there are permitting requirements for activities such as grading, excavation, placement of fill, bank stabilization work, construction or placement of structures, and other similar activities within the regulatory floodplain.”
  • Short-term rentalsLimited

    Short-term rentals in Gallatin County zoning districts and unzoned areas.

    • A short-term rental generally means a residential dwelling rented for 30 days or less, or 28 days in some districts.
    • There are no county zoning restrictions on use in unzoned areas, but the Gallatin City-County Health Department has public-health and sanitation permitting requirements in both zoned and unzoned areas.
    • If short-term rentals are not mentioned in a specific zoning-district regulation, they are not permitted in that zoning district.
    • Listed examples include permitted, conditional, principal-use, and allowed-by-right classifications depending on district and sub-district.
    • Conditional use requires a Conditional Use Permit and public hearing.

    short-term rental period: <= 30 days or less (28 days in some districts)

    “There are no restrictions on use in unzoned areas, so in terms of zoning, short-term rentals are allowable in these areas from the County Planning perspective. However, the Gallatin City-County Health Department has permitting requirements regarding public health and sanitation for short-term rentals in both zoned and unzoned areas. If short-term rentals are not mentioned in the specific zoning district regulation, they are not permitted anywhere in that zoning district.”
  • Permit feesPublished (with conditions)

    County Planning Department fee schedules for planning and land-use applications.

    • A new fee schedule went into effect on September 21, 2026.
    • The research record does not reproduce the fee amounts because the official planning page announces the effective date but the fee schedule itself was not opened.
    “IMPORTANT NOTICE: A new fee schedule went into effect on September 21, 2026. View the new fee schedule here.”
  • Permit processPublished (with conditions)

    County Land Use Permit application process.

    • LUP applications must include all required information before processing begins.
    • The property owner is responsible for obtaining necessary LUP approvals before construction.
    • Applications are submitted online through the County's MyGov portal.
    • Fees may be paid by credit card with an additional 3% processing fee, or by check or cash.
    • Applicants should allow a minimum of four weeks for staff processing.

    credit-card processing fee: 3 percent · minimum processing time: >= 4 weeks (seasonal demand may change processing times)

    “All LUP applications must be submitted online through the County’s MyGov portal. Instructions are available here. Fees are payable by credit card with an additional 3% processing fee. Alternatively, application fees may be paid by check or cash in the Planning Office, or by mail.”
    One more reviewed finding on this topic
    • Partial — County planning and land-use application processes in Gallatin County.
      “A completed septic application includes: Completed and signed Wastewater Treatment System form Completed and signed Property Information Request form Fee payment, click here for details A scaled site plan showing the proposed system”

Montana rules that apply here

  • Owner-builder exemptionConditional

    A homeowner performing plumbing installation in the owner's personal-use residence under Montana state jurisdiction.

    • The homeowner must perform the plumbing installation personally.
    • The residence must be for the owner's personal use.
    • The residence must not be built on speculation of resale.
    • The residence must not be intended as a rental property.
    • Certified local governments may enforce the plumbing code within their jurisdictional areas; all other areas fall under state jurisdiction.
    • This claim concerns the plumbing-permit exemption and does not establish exemption from county Land Use Permit requirements or every other building, electrical, mechanical, septic, or zoning requirement.
    “Homeowners do not need to obtain a plumbing permit provided he/she is doing the plumbing installation themselves and the residence is for the owner's personal use and not built on speculation of resale or intended as a rental property.”
    One more reviewed finding on this topic
    • Available — An owner working on the owner's property, or an owner contracting for work performed by a registered construction contractor, under Montana's construction-contractor licensing chapter.
      “(13) to an owner working on the owner's property, whether occupied by the owner or not, but this exemption does not apply to an owner”
  • Building code adoptedAdopted (with conditions)

    Montana's uniform state building code for residential and commercial buildings statewide.

    • The currently listed codes are amended and adopted through Administrative Rules of Montana Title 24, Chapter 301.
    • Cities, counties, and towns may enforce local building codes, all or in part, only through certified local building-code-enforcement programs.
    • State-owned agencies must be permitted through the Montana Department of Labor and Industry.
    • The listed 2021 International Building, Residential, and Existing Building Codes and related codes are effective June 11, 2022; the listed ASME boiler and pressure-vessel codes are effective November 6, 2021.

    International Building Code edition: 2021 · International Residential Code edition: 2021 · effective date for listed principal codes: 2022-06-11 (ASME boiler and pressure-vessel codes listed on the official page are effective 2021-11-06)

    “In addition, the program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings across Montana.”
    2 more reviewed findings on this topic
    • Adopted (with conditions) — Montana building-code requirements that may apply to qualifying construction in Gallatin County.
      “In addition, the program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings across Montana.”
    • Partial — Montana's statewide building-code framework for residential and commercial construction.
      “In Montana, cities, counties and towns have the option to enforce local building, electrical, plumbing, and mechanical codes, all or in part (except for state-owned agencies, which must be permitted through this Department). These local building code enforcement programs must be certified by the BC Program. The remaining cities, counties and towns that have chosen not to enforce building codes, fall under the jurisdiction of the BC Program. [...] the program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings across Montana.”
  • Certificate of occupancyLimited

    Buildings constructed in accordance with the Montana state building code or a county, city, or town building code.

    • The certificate must certify that the building conforms to the applicable building regulations.
    • The statute addresses certificates for buildings constructed under the state or local building code; it does not establish a universal certificate requirement for every structure or every occupancy.
    “A certificate of occupancy for a building constructed in accordance with the provisions of the state building code or county, city, or town building code must certify that the building conforms to the requirements of the building regulations applicable to it.”
  • Manufactured homesAllowed (with conditions)

    Manufactured housing used as residential housing within Montana municipalities that exercise zoning powers under MCA Title 76, chapter 2, part 3.

    • Municipal zoning regulations may not treat manufactured housing or factory-built housing units differently from other residential units.
    • Placement remains subject to applicable municipal zoning districts, permits or variances where required, building-code requirements, and other applicable health and safety rules.
    • The statute defines manufactured housing as a single-family dwelling built offsite in a factory and compliant with applicable prevailing HUD standards; a manufactured home does not include a mobile home or housetrailer as defined in 15-1-101, MCA.
    • The source addresses municipal zoning and does not establish unrestricted occupancy on unzoned or county land statewide.
    “Zoning regulations adopted under this part may not treat manufactured housing or factory-built housing units differently from any other residential units.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in jurisdictional areas where a Montana county has established zoning regulations under MCA Title 76, chapter 2, part 2.

    • The county zoning regulations must allow at least one accessory dwelling unit by right on a lot or parcel containing a single-family dwelling.
    • The unit may be attached, detached, or internal.
    • The county may not require owner occupancy, a familial, marital, or employment relationship between occupants, or impact fees; private restrictive covenants remain possible but cannot be required as a permit, license, or use condition.
    • A county may charge up to $250 for a one-time ADU application-review fee, in addition to usual building fees.
    • Applicable building codes, fire codes, and public-health and safety regulations still apply.
    • The county may require expedited sanitation review for an ADU on a parcel with existing public water and wastewater capacity; the 15-day expedited-review provision terminates September 30, 2029.
    • The statute applies to a county that exercises zoning powers; it does not itself create county zoning where none exists.

    maximum one-time application-review fee: <= 250 USD (Usual building fees may also be required.) · expedited sanitation review: 15 days (Parcel must have existing public water and wastewater service with capacity.)

    “In jurisdictional areas where the board of county commissioners has established zoning regulations under this part, the regulations must allow a minimum of one accessory dwelling unit by right on a lot or parcel that contains a single-family dwelling.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units in Montana municipalities that exercise zoning powers under MCA Title 76, chapter 2, part 3.
      “A municipality shall adopt regulations under this chapter that allow a minimum of one accessory dwelling unit by right on a lot or parcel that contains a single-family dwelling.”
  • Well permitLimited

    New groundwater developments in Montana using 35 gallons per minute or less and no more than 10 acre-feet per year.

    • All water uses starting after June 30, 1973, require a water right either through a water-use permit or an exception to the permitting process.
    • The development may qualify for the exception; qualification is not automatic.
    • Completed groundwater uses that meet the permit exception receive a Groundwater Certificate rather than a water permit.
    • A permitted water right is required for a combined appropriation from the same source by two or more wells or developed springs exceeding 10 acre-feet, regardless of flow rate.
    • All lots in a multi-phase subdivision must share a combined water-use limit of 10 acre-feet per year to qualify for a permit exception.
    • Beginning January 1, 2026, a water user intending to develop water use through a permit exception must file a Notice of Intent with DNRC before using water from an exempt well.
    • DNRC reviews a correct and complete Notice of Intent within 10 business days; if eligible, it authorizes the Notice of Intent and gives the user five years to complete the project, put the water to use, and file a Notice of Completion.
    • If the proposed use is not eligible, the Notice of Intent is denied and the user is directed to the water-right permit process.
    • The Notice of Intent filing fee is $400.
    • An authorized Notice of Intent expires after five years, with an opportunity for one five-year extension.

    maximum flow rate: <= 35 gpm · maximum annual volume: <= 10 acre-feet per year · Notice of Intent fee: 400 USD (Beginning January 1, 2026) · Notice of Intent review period: 10 business days (For a correct and complete Notice of Intent) · authorized Notice of Intent term: 5 years (One five-year extension opportunity is available)

    “Permit Exceptions, a.k.a. Exempt Wells: Small groundwater developments that use 35 gpm or less and do not exceed 10 acre-feet per year are known as “exempt wells” and may qualify for an exception to the water permit process.”
    One more reviewed finding on this topic
    • Required — Surface-water uses and groundwater uses exceeding 35 gallons per minute or 10 acre-feet per year in Montana.
      “Water Permits: A water permit is required for all surface water use and groundwater uses over 35 gallons per minute (gpm) or 10 acre-feet per year.”
  • Campground & park staysLimited

    Camping in Montana Fish, Wildlife & Parks public-use sites.

    • Camping is prohibited except in areas specifically designated or marked for camping.
    • A camping unit, vehicle, equipment, or personal items may not be left overnight without a person present.
    • Camping longer than 7 nights at one or more campsites in a public use area during any consecutive 30-day period is prohibited unless otherwise posted by the department.
    • Designated occupancy limits must not be exceeded.
    • Special-use-permit terms must be followed unless otherwise posted.
    • Campsites must be vacated by 1 p.m. on the day of departure; camping facilities must be vacated by 12 p.m. on the day of departure.

    maximum camping duration: <= 7 nights per consecutive 30-day period (unless otherwise posted by the department) · campsite departure time: 1 p.m. · camping-facility departure time: 12 p.m.

    “Unless otherwise posted by the department, within a public use site it is prohibited to: [...] camp at one or more campsites in a public use area for a period of longer than 7 nights during any consecutive 30-day period, beginning with the first night occupied unless otherwise posted by the department;”
    One more reviewed finding on this topic
    • Limited — Dispersed and designated-campground temporary camping on legally accessible Montana state trust land administered by DNRC.
      “Dispersed camping is allowed on state trust land with the appropriate permit and with certain restrictions. Dispersed camping on state trust land is allowed with a Conservation License. Camping that is incidental to hunting or fishing is permitted through your conservation license, and no additional permitting is required. Group camping requires a special recreational use license. On leased or licensed land: 2 days On unleased/unlicensed land: 16 days within a 30-day period Within designated campground: 16 days within a 30-day period”
  • county zoning authorityGeneral

    Montana county boards of commissioners' authority to adopt zoning regulations, including in unincorporated portions of established jurisdictional areas.

    • The board of county commissioners must have adopted a growth policy pursuant to Title 76, chapter 1.
    • Zoning may be adopted for all or parts of the jurisdictional area in accordance with Title 76, chapter 2, part 2.
    • Within unincorporated portions of an established jurisdictional area, the board may establish zoning regulations by resolution or divide the county into zoning districts.
    • Zoning regulations may regulate the erection, construction, reconstruction, alteration, repair, location, or use of buildings or structures and the use of land.
    • An action challenging creation of a zoning district or adoption of zoning regulations must be commenced within 6 months after the board's order.
    • Regulations in one district may differ from those in other districts.
    • The statute also states that zoning regulations may not treat manufactured housing or factory-built housing units differently from other residential units, subject to the statutory presumption concerning placement.

    challenge period: 6 months (after the date of the board order creating the district or adopting the regulations)

    “For the purpose of promoting the public health, safety, morals, and general welfare, a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations for all or parts of the jurisdictional area in accordance with the provisions of this part.”
    One more reviewed finding on this topic
    • General — Montana county boards of commissioners adopting zoning regulations for all or parts of their jurisdictional areas, including unincorporated portions where the statutory prerequisites are met.
      “a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations”
  • county building authorityGeneral

    Montana counties may adopt and enforce building codes and require construction permits for residential construction in unincorporated county areas, subject to the statutory certification, geographic, code-content, and permit requirements.

    • A county may adopt a building code by ordinance or resolution, or authorize adoption by administrative action.
    • A county may adopt its building code on a countywide basis unless a city or town within the county has adopted a building code; the county may not enforce its county building code within that city or town.
    • The county code-enforcement program must be certified by the Montana Department of Labor and Industry.
    • The current adopted code, current fee list, and current enforcement plan must be filed with and approved by the Department.
    • Inspectors must satisfy the stated state-licensing or approved national-certification requirements.
    • Except for voluntary incentive-based energy-conservation standards, the county may not adopt or enforce a building code more stringent than the code adopted by the Department or required by state law.
    • The county may prohibit construction from commencing until the required permit is issued after compliance is shown.
    • The general construction-permit requirement applies to buildings subject to Title 50, chapter 60, parts 1 through 4.
    • State agency-owned buildings remain under state Department jurisdiction for plan review, permitting, and inspections.
    “The local legislative body of a county, city, or town may adopt a building code to apply to the county, city, or town by an ordinance or resolution, as appropriate: (a) adopting a building code; or (b) authorizing the adoption of a building code by administrative action.”
    One more reviewed finding on this topic
    • General — Montana counties' authority to adopt and enforce building codes and require building-code administration for construction in county areas, including unincorporated areas.
      “The local legislative body of a county, city, or town may adopt a building code to apply to the county, city, or town by an ordinance or resolution, as appropriate: (a) adopting a building code; or (b) authorizing the adoption of a building code by administrative action.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Camping on your land — Temporary camping on private land in Gallatin County.
  • Tiny homes — Tiny-home occupancy on private land in Gallatin County.
  • Septic inspection — Inspection requirements for septic systems in Gallatin County.
  • Off-grid sanitation — Off-grid sanitation and on-site wastewater treatment in Gallatin County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Gallatin County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Montana’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt up to a limit

Montana's exempt-well exception (85-2-306 MCA) was tightened after Upper Missouri Waterkeeper v. DNRC (2024), and from Jan 1, 2026 appropriators must file a Notice of Intent with DNRC before putting exempt groundwater to use.

Limit: 35 gpm or less AND ≤10 acre-ft/yr; a combined appropriation exceeding 10 acre-ft needs a permit regardless of flow rate

Montana DNRC — Water Rights Permit Exceptions (Exempt Wells) ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Montana state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Gallatin County, Montana

Is Gallatin County a good place to live off-grid or homestead?

Gallatin County scores 77/100 on the Bolthole Index, a strong county profile. Its strengths: deep seclusion — about 2,056 people within a 30-minute drive and a stronger property-autonomy legal backdrop.

Do you need a building permit in Gallatin County, Montana?

Gallatin County requires a building permit only in limited cases (such as floodplains or specific zones), and it enforces county zoning. Onsite septic is permitted by Gallatin City-County Health Department (Environmental Health). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Gallatin County?

Living in an RV on your own land in Gallatin County is limited to specific cases: Rent or lease of multiple spaces for recreational camping vehicles and recreational-vehicle camping parks in areas governed by Gallatin County subdivision regulations. The area must be submitted for review and approved by the Governing Body before possession of any portion may be conveyed. Proposals with six or more recreational camping vehicle units follow the Major Subdivision procedure; proposals with five or fewer follow the Minor Subdivision procedure. Confirm with the county before relying on it.

How much does land cost in Gallatin County, Montana?

Land in Gallatin County runs about $4,069 per acre, based on the latest county data.

What is the water situation in Gallatin County?

Gallatin County gets about 24.4" of rain a year, with severe drought in roughly 9.4% of years. On water rights, Gallatin County lies in the Yellowstone Compact Controlled Groundwater Area — NPS-Montana Compact CGWA covering drainages north/west of Yellowstone to protect the park's geothermal/water resources; new groundwater appropriations of any size require a DNRC permit (the 35-gpm exempt-well basis is suspended)..

How remote is Gallatin County?

A representative private-land location has about 2,056 people within a 30-minute drive and 282,071 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Gallatin compares in Montana

Compare side-by-side →See all 56 Montana counties ranked →